<template>
    <div>
           <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
            title="添加商品信息"
            type="info" 
            center
            show-icon  :closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" 
        finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" 
        ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" 
        :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" 
                    type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight"
                    type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number"
                    type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                        expand-trigger="hover"
                        :options="catelist"
                        :props="cateProps"
                        v-model="addForm.goods_cat"
                        @change="handleChange">
                    </el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的item项 -->
                <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                :key="item.attr_id">
                <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                    <el-checkbox :label="cb" v-for="(cb,i) in 
                    item.attr_vals" :key="i" border></el-checkbox>
                    
                </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- //图片要上传到的api -->
                <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture"
                    :headers="headerObj"
                    :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button> 
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器内容 -->
                <quill-editor v-model="addForm.goods_introduce">
                </quill-editor>
                <!-- 添加商品按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">
                    添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
    </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
        
    </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

    export default{
        data(){
            return{
                activeIndex:'0',
                //添加商品的表单数据对象
                addForm:{
                    goods_name:'',
                    goods_price:0,
                    goods_weight:0,
                    goods_number:0,
                    //商品所属的分类数组
                    goods_cat:[],
                    //图片的数组
                    pics:[],
                    //商品详情描述
                    goods_introduce:'',
                    attrs:[]
                },
                addFormRules:{
                    goods_name:[
                        { required:true,message:'请输入商品名称',
                    trigger:'blur'},
                    ],
                    goods_price:[
                        { required:true,message:'请输入商品价格',
                    trigger:'blur'},
                    ],
                    goods_weight:[
                        { required:true,message:'请输入商品重量',
                    trigger:'blur'},
                    ],
                    goods_number:[
                        { required:true,message:'请输入商品数量',
                    trigger:'blur'},
                    ],
                    goods_cat:[
                        { required:true,message:'请输入商品分类',
                    trigger:'blur'},
                    ],
                },
                //商品分类列表
                catelist:[],
                cateProps:{
                    label:'cat_name',
                    value:'cat_id',
                    children:'children'
                },
                //动态参数列表数据
                manyTableData:[],
                //静态属性列表数据
                onlyTableData:[],
                //上传图片的URL地址
                uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers的请求
                headerObj:{
                    Authorization:window.sessionStorage.getItem('token')
                },
                previewPath:'',
                previewVisible:false
            }
        },
        created(){
            this.getCateList()
        },
        methods:{
            //获取所有商品分类数据
           async getCateList(){
              const{data:res} = await 
              this.$http.get('categories')

              if(res.meta.status !==200){
                return this.$message.error('获取商品分类失败')
              }
              this.catelist = res.data
              console.log(this.catelist)
            },
            //级联选择器选中项变化，会触发这个
            handleChange(){
                console.log(this.addForm.goods_cat)
                if(this.addForm.goods_cat.length 
                !== 3){
                    this.addForm.goods_cat =[]
                }
            },
            beforeTabLeave(activeName,
            oldActiveName){
                // console.log('即将离开的标签页名字是:'
                // + oldActiveName)
                // console.log('即将离开的标签页名字是:'
                // + activeName);
                // return false
                if(oldActiveName ==='0' &&
                this.addForm.goods_cat.length !==3){
                    this.$message.error('请先选择商品分类')
                    return false
                }
            },
            async tabClicked(){
                // console.log(this.activeIndex)
                if(this.activeIndex ==='1'){
               const{data:res} =  await  this.$http.get(`categories/${this.cateId}/attributes`,
                    {params:{sel:'many'}
                 }
                )

                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败!')
                }
                console.log(res.data)
                res.data.forEach(item =>{
                    item.attr_vals = 
                    item.attr_vals.length === 0 ? []
                    : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
              }else if(this.activeIndex ==='2')
              {
              const {data:res} = await  this.$http.get(`categories/${this.cateId}/attributes`,
                    {params:{sel:'only'}
                 })

                 if(res.meta.status!==200){
                    return this.$message.error('获取静态属性失败!')
                 }

                 console.log(res.data)
                 this.onlyTableData = res.data
              }
            },
            //处理图片预览
            handlePreview(file){
                console.log(file)
                this.previewPath = file.response.data.url
                this.previewVisible = true
            },
            //处理移除图片的操作
            handleRemove(file){
                // console.log(file)
                const filePath = file.response.data.tmp_path
               const i =
                 this.addForm.pics.findIndex(x => x.pic == filePath)
                 this.addForm.pics.splice(i,1)
                 console.log(this.addForm);
            },
            //监听图片上传成功的事件
            handleSuccess(response){
                console.log(response)
                const picInfo = { pic: response.data.tmp_path}
                this.addForm.pics.push(picInfo)
                console.log(this.addForm)
            },
            //添加商品
            add(){
                this.$refs.addFormRef.validate(async valid=>{
                    if(!valid){
                        return this.$message.error
                        ('请填写必要的表单项')
                    }
                    //执行添加的业务逻辑
                  const form = _.cloneDeep(this.addForm)
                    form.goods_cat = 
                    form.goods_cat.join(',')
                    //处理动态参数
                    this.manyTableData.forEach(item =>{
                        const newInfo ={
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals.join(' ')
                    }
                        this.addForm.attrs.push(newInfo)
                    })
                    //处理静态属性
                    this.onlyTableData.forEach(item =>{
                        const newInfo ={
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals }
                            this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    console.log(form);

                    //发起请求添加商品
                    //商品名称必须是唯一
                    const {data:res} = await this.$http.post('goods',form)

                    if(res.meta.status !==201){
                        return this.$message.error('添加商品失败！')
                    }

                    this.$message.success('添加商品成功')
                    this.$router.push('/goods')
                })
            }
        },
        computed:{
            cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
               } 
               return null
            }
        }
    }
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0!important;
}

.previewImg{
    width:100%
}

.btnAdd{
    margin-top:15px;
}
</style>